Back to Catalog
TOI-1243 b is a Neptune-like exoplanet (an ice giant with a thick atmosphere), about 2.3 times the radius of Earth. It has an equilibrium temperature of 450 K (177°C). The planet completes one orbit around its star every 4.7 Earth days. It was discovered in 2026 using the transit method. It orbits the M-type star TOI-1243, located approximately 43 parsecs (141 light-years) from Earth.
2026
Discovered
7.7
Earth Masses
2.33
Earth Radii
450
Temperature (K)
Discovery Information
Discovery MethodTransit
Discovery Year2,026
Discovery FacilityTransiting Exoplanet Survey Satellite (TESS)
Orbital Properties
Orbital Period4.6595 days
Semi-Major Axis0.0438 AU
Inclination88.24 deg
Physical Properties
Mass (Jupiter)0.0242 MJ
Mass (Earth)7.7 M⊕
Radius (Jupiter)0.2079 RJ
Radius (Earth)2.33 R⊕
Density3.3 g/cm3
Eq. Temperature450 K
Planetary Extremes
Where TOI-1243 b sits on the spectrum of all known exoplanets.
Mass7.7 M⊕
FeatherweightColossus
Radius2.33 R⊕
TinyEnormous
Temperature450 K
FrozenInferno
Year Length4.7 days
LightningGlacial
Density3.30 g/cm³
FluffyIron-dense
Star Distance0.044 AU
ScorchedFrozen exile
Star System View
Loading 3D view...
Size Comparison
2.33x Earth's radius (0.21x Jupiter)
Orbit Comparison
Earth: 365.25 days (1 AU)TOI-1243 b: 4.7 Earth days (0.044 AU)
Host Star: TOI-1243
Spectral TypeM2.0 V
Effective Temperature3,515 K
Mass0.515 M☉
Radius0.511 R☉
Size vs Sun1.96x smaller
Luminosity0.0359 L☉
Luminosity vs Sun27.9x dimmer
Metallicity [Fe/H]-0.2
Distance (pc)43.1865 pc
Distance (ly)140.9 light-years
Planets in the TOI-1243 System
What If You Lived Here?
99.3 kg
Your weight (from 70 kg)
1.42g
Heavy
Every step takes effort. Climbing stairs is exhausting.
4.7 Earth days
Year length
Red sunrise
Test Your Knowledge
Related Research
Loading papers...